U01B0, U1501, U1510 DTC codes, please help.

This is for some US cars, but looks relevant - U01B0 is a battery current sensor communications fault on a Vauxhall Insignia & the others look to be indirectly related.

Thanks for that rjenkinsgb.

It seems to be relevant, as start/stop function doesn`t work and A/C cooling doesn`t work.

Do you have any practical tips how to start dealing with this issue?

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The battery current sensor is often on the negative terminal, and communication to that often uses LIN.

I would start by looking for the current sensor and seeing what communication lines connect to it.

rafaluk11 said:

Do you have any practical tips how to start dealing with this issue?

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Work through the checks in the document?

Also, stop-start systems can be extremely sensitive to the battery condition. If it's more than three years old, or ever been fully discharged, it may need replacing even if it tests OK.

That may involve resetting the stored battery age and type using a scanner.

With vehicles that need such settings, replacing the battery without also resetting the parameters will not work - the new battery gets treated as if it's aged and lost capacity regardless!

It MUST also be the correct type, usually AGM, rather than a generic battery.

I have disconnected battery for 30 minutes and two faults have disappeared now and only one stays on U1501.

rafaluk11 said:

I have disconnected battery for 30 minutes and two faults have disappeared now and only one stays on U1501.

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That says that there is a LIN bus fault.

Have you got any way of monitoring the LIN bus to the voltage / current sensor?

How should I do this please?

A LIN analyser would be best, but an oscilloscope would be quite helpful. You can find some information just using a multimeter.

I have got a multimeter and just bought some cheep oscilloscope from amazon.
What exactly should I measure up? What pins? What values to expect?

The battery monitor is most likely attached to the battery negative terminal. It probably has two other connections. One of those goes to the battery +ve, and it is the other one that you are interested in.

Record the waveform on the connection that doesn't go to the battery +ve and post it here.

Here is a LIN waveform recorded from a car:-



There are two frames shown, the first is 8 bytes and the second is 4 bytes. On every frame, the break (purple, marked as 1.355 ms) the sync (turquoise, labelled 55) and the ID (green, marked F0 or 20) is sent by the master module. The data that follows (00 00 00 00 3F FD 28 00 or 00 00 08 00) and the checksum (9A or F7) can come from the master or from the slave.

The battery monitor will almost certainly be a slave.

It can help to put a resistor of about 100 Ohm in series with the LIN wire when monitoring with an oscilloscope. The voltage levels will be slightly different when the master is transmitting compared to when the slave is transmitting which can help working out what is going on.

If it is of any interest, the waveform above is from the LIN connection between the door module and the switchpack on the driver's door. More details here:- https://www.electro-tech-online.com...rear-windows-to-passenger-side-of-car.165710/

Thanks guys.
I have taken grill shutter motor out and checked all connectors with multimeter for continuity. I have found that one pin in the plug wasn't continuous and that caused all problems. As soon I have replaced that pin all works fine and no more DTC codes present.